Improved lock for piano



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.Tana-s Param Nolooot, man June 1, 1869.

VIMPROVE-D LOCK FOR. PIANO. 8cc.

The Schedue referred to in these Letters Patent and making part of thesame.

To all whom 'it may concern:

Be it known that I, HERRMANN AHREND, of Brook` lyn, in the county ofKings, State of New York, have invented a new and useful Improvement inLocks for Piano-Fortes, &e.; and I do hereby declare 'the following tobe a full, clear, and exact 'description thereof, which will enablethose skilled in the art to make and use the same, reference being hadto the accompanyving drawing, forming part of this specification, in

which drawing- Figure l represents a frontview of the lockingmechanismwhen lthe bolts are thrown back.

`Figure 2 is a sinilar View of the same when the bolts are thrownout.

Similar letters indicate corresponding parts.

This invention consists in the arrangement of two curved bolts, whichswing each on its separate pivot,

and are connected by a pin secured to the shank of' one bolt, andcatching in a slot in the shank of the other, in combination witharecess in the shank ot' one of the bolts, and with a notched springtumbler, which engages with a stud secured in the shank of the secondbolt, in sucha manner, that by the action.

ot' the key, the tumbler is raised, and the bit of the key enters therecess of the tii'st bolt, and bears against one of its sides, bothbolts are simultaneously thrown in or out, and the tumbler catches voverthe stud of the second bolt, and both bolts are firmly retained inposition.

In the drawingv The letter A represents a case, whichencloses themechanism of my lock.

Thismechanism consists essentially' of two curved bolts BB', which swingeach on its separate pivot b b', secured in the case,`and passingthrough the Shanks oi' the bolts, as shown in the drawing.

The Shanks of the bolts B B' overlap each other,l land in the shank ofthe bolt B is secured a pin, c,

which catches in a slot, d, in the shank of the bolt B, so that byturning one boit on its pivot, the other 4bolt is compelled to move withit.

The bolts are operated by-means of a key, willich is guided b'y the pina, and the bit of which catches in a notch, or recess e in the shank ofthe-bolt B.

From the shank of the bolt B projects a s/tud, f; l and a tumbler, O,which is provided with two notches gg', and subjected to the action ot'aspring, h, catches over this stud, and retains the bolts firmly inposition. [f the key isl inserted into the lock, and turned in thedirection of arrow 1, iig. 1, the tumbler is first lifted from stud j,and then the key catches in the recess e, and the bolts are thrown outto the position shown in tig. 2 "The tumbler descends, and its notch g'catches over the stud f, so that the bolts cannot be forced back by apressure against their outer ends. lIf the key is turned in thedirection of arrow 2, fig. 2, the bolts are carried back again to theposition shown in tig. l, and they are retained in this position by thetumbler C.

By these means a simple and durable lock is ohtained, which isapplicable to piano-fortes, sewing-ma chine cases, or other articles ofasimilar construction Having thus described my invention, What I claim asnew, 'and desire to secure by het` ters Patent, is- The bolts B B',swinging on separate pivots 11 b', and connected by a pin, c, and slotd, in combination with the tumbler C and stud j', all constructed and op`.erating substantially in the manner shown and described.

This specification signed by me, this (ith day oi' April, 1869.

HERRMANN AHREND. \Vitnesses: s

W. RAUM, E. F. KAsTnNuL'nu.

